js中 时间戳与日期相互转换，时间戳转换星期

const formatTime = date => {
const year = date.getFullYear()
const month = date.getMonth() + 1
const day = date.getDate()
const hour = date.getHours()
const minute = date.getMinutes()
const second = date.getSeconds()

return [year, month, day].map(formatNumber).join(’/’) + ’ ’ + [hour, minute, second].map(formatNumber).join(’:’)
}

const formatNumber = n => {
n = n.toString()
return n[1] ? n : ‘0’ + n
}

/**

• 时间戳转化为年 月 日 时 分 秒
• number: 传入时间戳
• format：返回格式，支持自定义，但参数必须与formateArr里保持一致
  */
  function formatTimeTwo(number, format) {
  var formateArr = [‘Y’, ‘M’, ‘D’, ‘h’, ‘m’, ‘s’];
  var returnArr = [];

// var date = new Date(number * 1000);
var date = new Date(number);
returnArr.push(date.getFullYear());
returnArr.push(formatNumber(date.getMonth() + 1));
returnArr.push(formatNumber(date.getDate()));

returnArr.push(formatNumber(date.getHours()));
returnArr.push(formatNumber(date.getMinutes()));
returnArr.push(formatNumber(date.getSeconds()));

for (var i in returnArr) {
format = format.replace(formateArr[i], returnArr[i]);
}
return format;
}
/**

• 数组分别存储年月日时分秒
• returnArr[0] 年
• returnArr[1] 月 等等
  */
  function yearMonthDate(number){
  var returnArr = [];
  var date = new Date(number);
  returnArr.push(date.getFullYear());
  returnArr.push(formatNumber(date.getMonth() + 1));
  returnArr.push(formatNumber(date.getDate()));

returnArr.push(formatNumber(date.getHours()));
returnArr.push(formatNumber(date.getMinutes()));
returnArr.push(formatNumber(date.getSeconds()));
return returnArr;
}
/**

• 得到星期几
• todate 格式为2019-04-16
• day 转换为todate后几天星期几
  */
  function getDates(day,todate){
  var dateArry =[];
  var dateObj = dateLater(todate, day);
  dateArry.push(dateObj)
  return dateArry;
  }
  function dateLater(dates,later){
  let dateObj =[];
  let show_day = new Array(“星期日”,“星期一”,“星期二”,“星期三”,“星期四”,“星期五”,“星期六”);
  let date = new Date(dates);
  date.setDate(date.getDate()+later);
  let day = date.getDay();
  let yearDate = date.getFullYear();
  let month=((date.getMonth()+1)<10?(“0”+(date.getMonth()+1)):date.getMonth()+1);
  let dayFormate = (date.getDate()<10?(“0”)+date.getDate():date.getDate());
  dateObj.time = yearDate+"-"+month+"-"+dayFormate;
  dateObj.week =show_day[day];
  return dateObj;
  }

/**

• 参数为 2017-12-08
• 返回时间戳
  */
  function dateChangeTimestamp(timestamp){
  var t = timestamp+" 00:0:00";
  var times = new Date(t);
  var time = times.getTime();
  return time;
  }

module.exports = {
formatTime: formatTime,
formatTimeTwo: formatTimeTwo,
yearMonthDate: yearMonthDate,
getDates:getDates,
dateChangeTimestamp: dateChangeTimestamp,
}